Emerson Rosemount 1152 Alphaline, Справочное руководство

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Reference Manual
00809-0100-4235, Rev BA
April 2007
2-3
Rosemount 1152
To minimize the possibility of errors, take the following precautions:
• Make impulse tubing as short as possible.
• Slope tubing at least one inch per foot up toward the process
connections for liquid and steam.
• Slope tubing at least one inch per foot down toward the process
connections for gas.
• Avoid high points in liquid lines and low points in gas lines.
• Use impulse tubing of sufficient diameter to avoid friction effects.
• Ensure that all gas is vented from liquid tubing legs.
• Ensure that the impulse tubing is of adequate strength to be compatible
with anticipated pressure.
For differential transmitters, consider the following:
• Keep both impulse legs at the same temperature.
• When sealing fluid is used, fill both piping legs to the same level.
• When purging is used, make the purge connection close to the process
taps and purge through equal lengths of the same size tubing. Avoid
purging through the transmitter.